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How to fix errors when signing in to Messages on Mac

Signing into Messages on Mac

You must sign in with your Apple Account (formerly Apple ID) to use iMessage on your Mac or sync your iPhone texts to it. It’s a simple process, but in some cases, you may see random errors that prevent you from logging in. Go through these quick tips if you see “An unknown error occurred,” “Error with Authentication,” or another similar message when signing into the macOS Messages app with your Apple Account.